Effects of hydroaromatics on post-oxidation of polyolefins induced by electron irradiation

Abstract

Additive effects of hydroaromatics towards radiation degradation and post-oxidation of high density polyethylene and isotactic polypropylene were investigated. At the same time, the radical scavenging effects of hydroaromatics were examined using DPPH(N,N-diphenyl-N'-picrylhydrazyl). It was found that:

• 1.

  (1) the addition of HHAP (multi-component type hydroaromatics, produced by the hydrogenation of highly aromatic heavy fraction from petroleum) was obviously effective in inhibiting both radiation (electron beam in air) degradation and post-oxidation of polyolefins,

• 2.

  (2) hydroaromatics (tetralin, octahydrophenanthrene and HHAP) have evident radical scavenging abilities from the tests using DPPH and

• 3.

  (3) the inhibiting effects of HHAP can be attributed to its radical scavenging ability.